Gas-burning appliance



J. S. HEALY.

GAS BURNING APPLIANCE.-

APPLICATION FILED JUNE 25, 1920.

Patented July 26, 1921.

flmrzz/n J. 9 m s UNITED STATES".

PATENT OFFICE.

JOHN S. HEALY OF BROOKLYN, 'NEW YORK.

" I I Application filed June 25 To all whom it may concern: I

' Be it known that I, JOHN S. HEALY, a citizen of the United States, residin at Brooklyn, in the county of Kings and tate of New York, have invented a new and useful Gas-Burning Appliance, of which the following is a specification.

This invention relates to the mixing of gas and air preparatory to combustion, and the principal objects thereof are to provide as near perfect'combustion as possible by the proper mixing; to effect a saving in the gas required to 'produce a given amount of heat; to provide a system which will be very simple in construction and contain few parts and will apply the flame direct to the article to be heated without over-heating any particular region, thus giving a uniform and safe application of heat; also to pro vide aconstruction of mixer that will work with any kind of burner, and thus be universally adaptable; and more specifically to provide a mixing device occupying very *littlelroomand suitable for use anywhere in which air under relatively low pressure can be employedfor bringing in atmospheric air and thoroughly mixing it with the gas which'it then conveysdirectly to the burner. Further objects and advantages of the invention will appear herein.

Referenceis to be had to the accompanying drawingsin which Figure l is a central sectional view of a stereotype melting furnace with a preferred embodiment of I this invention 7 applied "theretojand Fig. 2 is a sectional view on the line 22 I have shown the invention as applied to themelti'ng pot of a stereotype melting furnace which, as ordinarily constructed, will hold a large amount of metal, perhaps 20,000 lbs. This must all be pumped out in sixty minutes at a temperature of 650 degrees. This invention has been successfully used with such a furnace which furnishes obviously a severe test to its value.

The melting pot 10 of the stereotype melting furnace is shown as mounted in the usual way, and I have not shown its upper connections. Under it is placed a gas burner 11 shown as of the annular type having a flat ring directly under the pot pierced by numerous jet openings arranged in a circle. This burner is shown as having a space 12 at the bottom of cup-shape com- GAS-BURNING APPLIANCE.

Specification of Letterslatent. Patented July 26', 1921.

, 1920. Serial no. 391,623.

municating through an opening 13 with a passage 14, preferably in the form of a pipe, for the inlet of the combustible mixture. This pipe 14 leads directly from a small chamber 15, This chamber is supplied with gas through a pipe 16 in any ordinary way, the pipe entering at one side.

Projecting into this chamber 15 past the opening 17 for the admission of the gas is a nozzle 18. This nozzle has behind it an annular chamber 19 into which air is pumped through a pipe 20 under comparatively low pressure. I have found 6 lbs. pressure to be sufiicient. A positive pressure blower is employed to produce a large flow of air at about that pressure. The air is introduced through the pipe 20 as stated and -hasdirect control over the admission of the free air which comes in concentrically in the center of the nozzle. This nozzle has a uniform accurate action. I use no shutter -or'other adjustment of the free air pipe, so that it has free admission which is uniform under all conditions. By employing only a low pressure I avoid the use of a compressor. The opening from the pipe20 enters the annular chamber 19 at one side and at the rear of the nozzle 18. This nozzle and the chamber are both made annular from the fact that a pipe 21 enters them centrally and passes concentrically all the way through them'to the inner end of the nozzle. This pipe 21 extends in from the outside of the building for the purpose of conducting atmospheric air into "the mixing chamber 15.

It will be noted that the nozzle so-called, 18, is of reduceddiameter with respect to the chamber 19 soas to form an annular jet 10f compressed air issuing out into the mix ing chamber 15 and directly into the end of the pipe or passage 14. The mixing chamber surrounds the end of the pipe 21 and brings in the atmospheric air by induction. This reduces the pressure in the chamber 15 somewhat and sets up eddy currents of air therein which assist in taking up the gas from the opening 17 at the rear of this mixing chamber, assuring a complete mixture of the gas and air. The gas, coming in on one side only under the lower pressure, apparently has the effect of spreading in both directions around the projecting nozzle 18 and thus somewhat modifies the annular current of air under a slightly higher pressure which issues into the mixing chamber l5. This seems to add to the effectiveness of the mixing operation and yet the mixing chamber is so small and the distance between the nozzle 18 and the end' of the passage 14 so short that the ingredients pass directly to the latter and from there to the burners, requiring no further:

mixing operation and not having time to separate in any way before combustion takes place.

As the free air is piped to the T 22 in which the chambers 15 and 19 are located, as

well as the nozzle 18, it passes into the gas in the mixing chamber and then to the burner. Once the parts are properly proportioned and adjusted this mixing device gives only one result, namely, perfect combustiona It is to be noted also that this system involves the direct heating of the melting pot 10 or other device to be heated, and that the use of small burners or'clusters of burners is entirely done away with, a burner being provided which will last indefinitely and not requiring frequent replacement.

It is to be noted thatthe air under pressure, the free air and the gas all meet at the same point, that is in the small mixing chamber 15, and the success of the device is undoubtedly due mainly to the proper combi- The mixing occurs at the point at what I'do claim is nation of these three elements and the bringing of them togetherwithin this small area. This in fact is so small that it is hardly properly descriptive to call it a chamber. which the air issues from the nozzle 18.

Although I have illustrated and described only one form of the invention I am aware of'the fact that modifications can be made therein by anyperson skilled in the art without' departing from the scope of theinvention as expressed in the claims. Therefore I do not wish to be limited to all the details of construction, orto the special form of burner herein shown and described, 'but 1. Ina gas burning appliance, the combination with a burner having a passage leading "thereto and directl communicating therewith, of a-mixing c amber connected directly with and leading directly into said passage, a nozzle located concentrically at the intake end of said passage and in alinement therewith, means for directing air under pressure into the passage, said nozzle of said air pipe and, forming an annular passage around it, means for introduoting air under low pressure into said chamber to draw in the atmospheric air. and'force them both into the first named pipe, and means for introducing gas into said chamber at the rear of the end of said air pipe, whereby the gas will be mixed with the air' at the point at which the gas issues from the annular passage.

,3. In a gas burning appliance, the'coinbination with afburnerfhaving a passage therewith, of a mixing device connected directly with said passage and comprisinga chamber, a pipe for admitting atmospherlc air located centrally in alinement with said passage, a nozzle concentrically surrounding the discharge end of said pipe, an annular chamber connected with the nozzle, means for introducing air un'derlow pressure into said. annular chamber, the nozzle, and pipe terminating substantially at the samepoint, and means for introducing gas into the. first named chamber around said nozzle, whereby the pressure air draws in atmospheric air and both are discharged under reduced pressure through the first named .chamber'directly into said passage drawingin the'gas with them and thoroughl mixing the same.

In testimony whereof have hereunto affixed my signature.

' JOHN S. HEALY.

leading thereto and directly communicating 

